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Showing papers in "International Journal of Heat and Fluid Flow in 2005"


Journal ArticleDOI
TL;DR: In this article, the problem of laminar forced convection flow of nanofluids has been thoroughly investigated for two particular geometrical configurations, namely a uniformly heated tube and a system of parallel, coaxial and heated disks.

929 citations


Journal ArticleDOI
TL;DR: In this article, aqueous-based nanofluids are formulated in such a way that they are found very stable and are used to investigate their heat transfer behavior under the natural convection conditions.

430 citations


Journal ArticleDOI
TL;DR: In this paper, the performance of six well-known turbulence models for the study of supersonic ejectors was evaluated and the results showed that the k-omega-sst model agrees best with experiments.

323 citations


Journal ArticleDOI
TL;DR: In this article, the authors used the time averaged entropy balance equation to calculate the entropy in turbulent shear flows with heat transfer, which can serve as a parameter to determine the efficiency of turbulent heat transfer processes.

238 citations


Journal ArticleDOI
TL;DR: In this article, a hybrid RANS-LES methodology is proposed for simulating flows that demand a high-quality resolution of the near-wall region, which allows the thickness of the RANS layer to be chosen freely.

178 citations


Journal ArticleDOI
TL;DR: In this paper, a 3D numerical simulation was performed for laminar heat transfer and fluid flow characteristics of plate fin-and-tube heat exchanger, and the effects of five factors were examined: Re number, fin pitch, tube row number, spanwise and longitudinal tube pitch.

128 citations


Journal ArticleDOI
TL;DR: In this paper, a flat aluminium multi-port extruded tube composed of 11 parallel rectangular channels with hydraulic diameter of 2.01mm was used for ascendant forced flow boiling in mini-channels.

112 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigated the local heat transfer characteristics and the associated frictional head loss in a rectangular channel with inclined solid and perforated baffles and found that the inline placement of baffles augments the overall heat transfer significantly by combining both jet impingement and the boundary layer separation.

110 citations


Journal ArticleDOI
Danesh K. Tafti1
TL;DR: In this paper, two mesh resolutions, 96 3 and 128 3, were tested in a quasi-DNS mode and in LES mode with the Dynamic Smagorinsky model.

101 citations


Journal ArticleDOI
TL;DR: In this paper, the eddy-viscosity elliptic-relaxation approach was used for modeling and numerical computations of natural and mixed convection flows in turbulent regime.

99 citations


Journal ArticleDOI
TL;DR: In this paper, a numerical approach based on computational fluid dynamics (CFD) fluent code was used to test various turbulence closure models including the high and low Reynolds number form of the two-equation k- e model and the more advanced Reynolds stress model (RSM).

Journal ArticleDOI
TL;DR: In this paper, the flow structure change from the anti-phase to in-phase mode starts with a phase shift between gap vortices, and the dynamical role of gap bleeding between cylinders is investigated.

Journal ArticleDOI
TL;DR: In this paper, two-dimensional calculations for spontaneously nucleating flows of steam in converging-diverging nozzles are presented, showing the influence of boundary layer growth on streamwise pressure distributions and droplet sizes.

Journal ArticleDOI
TL;DR: In this paper, a scaling analysis for small bottom slopes reveals that three laminar flow regimes, namely conductive, transitional and convective flow regimes are possible depending on the Rayleigh number.

Journal ArticleDOI
TL;DR: In this article, the relative velocity between the two media is used in conjunction with the drag-force formula for the dominant of the two motions acting alone, and the results of exact solutions demonstrate that this model is flawed and underpredicts the drag force.

Journal ArticleDOI
TL;DR: In this article, an analytical one-dimensional solution of Fourier's conduction equation for a semi-infinite wall is used to measure the surface temperature in transient heat transfer experiments.

Journal ArticleDOI
TL;DR: In this paper, a large eddy simulation (LES) has been applied to turbulent thermal fields in a channel having one wavy wall for Prandtl number of 0.7.

Journal ArticleDOI
TL;DR: In this paper, the authors measured the boiling heat transfer coefficients of carbon dioxide (CO 2 ) in mini tubes with inner diameters of 2.0 and 0.98mm and analyzed them as a function of operating parameters.

Journal ArticleDOI
TL;DR: In this article, the authors investigated a new design concept for generating multi-scale structures in natural convection with the objective of maximizing the heat transfer density, or heat transfer rate per unit of volume.

Journal ArticleDOI
TL;DR: In this paper, a large number of new experimental data are presented on two-phase pressure drop, bubble size, gas hold-up and heat transfer coefficients for co-current upward gas/liquid flow through beds of different particle sizes under constant wall heat flux.

Journal ArticleDOI
TL;DR: In this paper, the authors present results of a numerical investigation of the impingement process of a droplet normally onto a wall film, based on the finite volume solution of the Navier-Stokes equations, in their axisymmetric formulation, expressing the flow field of the two phases, liquid and gas, coupled by the volume of fluid method (VOF).

Journal ArticleDOI
TL;DR: In this article, a model for fluid flow and heat transfer in a micro heat pipe of any arbitrary (polygonal) shape is presented utilizing a macroscopic approach, and coupled non-linear governing equations for the fluid flow, heat and mass transfer are developed based on first principles and are solved numerically.

Journal ArticleDOI
TL;DR: In this paper, a large-eddy simulation (LES) of a compressible nozzle/jet configuration has been carried out, where the Favre filtered Navier-Stokes equations were solved using a finite volume method solver with a low-dissipation third-order upwind scheme for the convective fluxes, a secondorder centered difference approach for the viscous fluxes and a three-stage second-order Runge-Kutta time marching technique.

Journal ArticleDOI
TL;DR: In this paper, a numerical simulation of high-pressure natural gas flow in pipelines was performed by solving the conservation equations for one-dimensional compressible flow, using the Runge-Kutta discontinuous Galerkin method, with third-order approximation in space and time.

Journal ArticleDOI
Ken Ichi Abe1
TL;DR: In this article, a hybrid approach connecting LES with the Reynolds-averaged Navier-Stokes (RANS) modeling in the near-wall region is studied, where an advanced nonlinear eddy-viscosity model is introduced to resolve the nearwall stress anisotropy more correctly.

Journal ArticleDOI
Hao Wang1, Xiaofeng Peng1, David M. Christopher1, W.K. Lin1, C. Pan1 
TL;DR: In this article, high-speed photography and laser PIV (particle image velocimetry) technology were employed to investigate subcooled boiling, particularly bubble dynamics on ultrathin platinum wires Bubble-top jet flows were experimentally observed and theoretically analyzed.

Journal ArticleDOI
TL;DR: In this paper, proper orthogonal decomposition (POD) has been used to extract salient features and offer a compact representation to the CFD solutions associated with boundary movement.

Journal ArticleDOI
TL;DR: In this article, an experimental and computational study for the flow development through a heat exchanger for aero-engine applications is presented, which consists of elliptic tubes in a U formation, the ends of which are attached to the collector pipe, which has a cylindrical cross section.

Journal ArticleDOI
TL;DR: In this paper, the development of unsteady free convective flow in a rectangular enclosure has been numerically studied using an iterative, semi-implicit finite-difference method.

Journal ArticleDOI
TL;DR: In this paper, a statistical approach to modeling dispersion and preferential concentration of inertial particles suspended in the turbulent fluid is presented, which departs from kinetic equations for the one-point and two-point probability density functions of particle velocity distributions in turbulent Gaussian fluid flow fields.